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Originally Posted by markg2
By what logic or rule or understanding do you know which # to divide by which #?
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The answer to that is found in the way you posed your original question:
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I want to know by what % product y is > than product x
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Therefore, 'y' is the numerator and 'x' is the denominator.
In this case, with x=$87.00 and y=$828.74:
'x' is 10.5% of 'y' ($87.00/$828.74)*100, which makes it 89.5% less than 'y' ($87.00/$828.74 -1)*100; and
'y' is 953% of 'x' ($828.74/$87.00)*100, which makes it 853% more than 'x' ($828.74/$87.00 -1)*100.